JUNO Reference Orientation CK File ============================================================= Created on Nov 24, 2020 by Martin Brennan, JPL. Summary ------------------------------------------------------------- This file contains a STUDY attitude profile for PJ34 using the SAMPLE Extended Mission Case 10+ trajectory, spk_SAMPLE_210221_251021_200206_EM_Case_10plus.bsp. The STUDY CK uses a 50 deg off-Earth tilt (50Tilt) to better observe Ganymede encounter inbound to PJ34. This 50Tilt attitude is defined by rotating the Juno +Z spin axis 50 deg from Earthpoint (Juno-Earth direction) toward the Juno-Ganymede direction, using the epoch 2021-JUN-07 17:00:00.000 UTC. The CK covers the orbit 34 dates of PJ-48hr to PJ+36hr, while the 50Tilt attitude spans the PJ window from PJ-24h to PJ+12h (2021-JUN-07 07:43:47.511 UTC to 2021-JUN-08 19:43:47.511 UTC). The Earthpoint orientation is used during the remaining times of the CK, 24 hours before and after the PJ window. CK Start: 06 JUN 2021 07:43:47.511 UTC CK Stop : 09 JUN 2021 19:43:47.511 UTC Implementation Notes ------------------------------------------------------------- The JUNO_SPACECRAFT orientation is provided in this file using a combination of two kinds of segments: - segments providing the orientation of the JUNO spin axis (+Z) encapsulated in the orientation of the JUNO_SPIN_AXIS frame (frame ID -61900) relative to the J2000 inertial frame. These segments were generated using SPICE utility program "prediCkt" based on the spin axis pointing profile from the source e-mail. See Appendix 1 below for more details about these segments ("prediCkt" inputs, fit accuracy, etc.) - segments providing the rotation of the spacecraft about the spin axis encapsulated in the orientation of the JUNO_SPACECRAFT frame (frame ID -61000) relative to the JUNO_SPIN_AXIS frame. These segments were generated using SPICE utility program "msopck" based on the rotation profile from the source e-mail. See Appendix 2 below for details about these segments ("msopck" setup parameters, input, etc.). The segments generated by "prediCkt" and "msopck" were merged together into a single file (this file) using SPICE utility "dafcat". After merging the file was augmented with these comments. Modeling Notes ------------------------------------------------------------- Users of this CK file should be aware that: - the time-lines in the source spreadsheet did not include Earth-repointing precessions - the spin axis pointing (+Z of the JUNO_SPIN_AXIS frame) was modeled to be within 0.25 degrees of JUNO-Earth, or JUNO-Anti Orbital Momentum Vector (depending of the attitude mode). The ZX plane of the JUNO_SPIN_AXIS frame was modeled to always contain Ecliptic North, with the +X axis to be as close to it as possible. Coverage ------------------------------------------------------------- This file provides continuous coverage for the following time period: Begin TDB End TDB ------------------------ ------------------------ 2021-06-06/07:44:56.696 2021-06-09/19:44:56.696 Related Kernels ------------------------------------------------------------- This was generated and must be used together with the following kernels: Type Name ---- ------------------------------------------ LSK naif0012.tls SCLK JNO_SCLKSCET.00096.tsc FK juno_v12.tf SPK jup310.bsp SPK spk_SAMPLE_210221_251021_200206_EM_Case_10plus.bsp Contact Information ------------------------------------------------------------- Contact Marty Brennan (martin.brennan@jpl.nasa.gov), or Stuart Stephens (stuart.k.stephens@jpl.nasa.gov) if you have any questions regarding this file. Appendix 1: Information for Spin Axis Orientation Segments ============================================================= This C-kernels was produced using the SPICE program "prediCkt" on 2020-NOV-24 11:27:57. The following files were provided in support of the construction of the attitude given in this kernel. File Type Name ---- ------------------------------------------ SPK /Users/mbrennan/Documents/JUNO/SPICE/spk/jup310.bsp SPK /Users/mbrennan/Documents/JUNO/SPICE/spk/+ spk_SAMPLE_210221_251021_200206_EM_Case_10plus.bsp TEXT /Users/mbrennan/Documents/JUNO/SPICE/lsk/naif0012.tls TEXT /Users/mbrennan/Documents/JUNO/SPICE/pck/pck00010.tpc This C-kernel matches the specification given below to 0.25000 degrees. The text kernel used to specify the orientation of structures included in this file is given below. ============================================================= Spin Axis Orientation ----------------------------------------------------------------- The spin axis Orientation segments contain the orientation data for the JUNO_SPIN_AXIS frame (frame ID -61900) relative to the J2000 inertial frame. This file contains a STUDY attitude profile for PJ34 using the SAMPLE Extended Mission Case 10+ trajectory, spk_SAMPLE_210221_251021_200206_EM_Case_10plus.bsp. The STUDY CK uses a 50 deg off-Earth tilt (50Tilt) to better observe Ganymede encounter inbound to PJ34. This 50Tilt attitude is defined by rotating the Juno +Z spin axis 50 deg from Earthpoint (Juno-Earth direction) toward the Juno-Ganymede direction, using the epoch 2021-JUN-07 17:00:00.000 UTC. The CK covers the orbit 34 dates of PJ-48hr to PJ+36hr, while the 50Tilt attitude spans the PJ window from PJ-24h to PJ+12h (2021-JUN-07 07:43:47.511 UTC to 2021-JUN-08 19:43:47.511 UTC). The Earthpoint orientation is used during the remaining times of the CK, 24 hours before and after the PJ window. CK Start: 06 JUN 2021 07:43:47.511 UTC CK Stop : 09 JUN 2021 19:43:47.511 UTC These segments were generated using PREDICKT with the direction, orientation, and schedule specifications provided below based on the spreadsheet data. Directions ----------------------------------------------------------------- The directions defined in this section are based on the descriptions from sheet 3 of the spreadsheet. TOSUN is the geometric position of the Sun relative to JUNO. TOEARTH is the geometric position of the Earth relative to JUNO. JUPN is the Jupiter North Pole vector defined in the J2000 frame. JUNOPOS is the geometric position of JUNO relative to Jupiter. JUNOVEL is the geometric velocity of JUNO relative to Jupiter. JUNOORB is the JUNO orbital momentum vector computed as the cross product of the JUNO position and velocity relative to Jupiter. PJ05_JUNOORB14 is the JUNO orbital momentum vector rotated by -14 deg about JUNOPOS, as used for PJ05. RA = -7.67890341853399 deg, DEC = 13.9432383950883 deg in EME2000 JNPXSUN is the cross product between Jupiter North Pole direction and the Sun direction relative to JUNO, set for PJ19 MWRX## tilt rotation axis. JNPXJUNO is the cross product between Jupiter North Pole direction and the Juno Position vector, set for PJ19 MWRXSTILT10 rotation axis. PJ19_MWRXSTILT10 is the South-facing MWR-crosstrack attitude tilted 1.5 deg about the Jupiter-Juno position vector at Equator-crossing (towards the East) and then tilted 10 deg North (in plane containing Jupiter N Pole and Juno Nadir) for PJ19 to allow for more Sun Exposure on solar cells and somewhat constant latitude coverage during each MWR swath. RA = 91.0515591011937 deg, DEC = -54.49840349731 deg in EME2000 PJ09_SUNOFF35 is a truncated MWR-TILT attitude for PJ09 set to achieve a 35 degree Sun-offset. RA = -4.43652617866635 deg, DEC = 16.0002139331956 deg in EME2000 PJ12_SUNOFFN30P20 is a truncated MWR -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ12, set to achieve a 35 deg Sun-offset. RA = 6.814291308591435 deg, DEC = 23.063601975942941 deg in EME2000 PJ16_SUNOFFN30P20 is a truncated MWR -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ16, set to achieve a 35 deg Sun-offset. RA = 22.5251963999149 deg, DEC = 29.7685436940511 deg in EME2000 PJ20_SUNOFFN30P5 is an untruncated MWR -30 deg azimuth (towards Jupiter dawn)/ +5 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ20. RA = 44.3942020462189 deg, DEC = 21.8505938576328 deg in EME2000 PJ24_SUNOFF59OPT is a attitude orientation for PJ24 redefined by JIRAM Team with the J2000 vector [0.78590 0.45582 0.41783] for Ganymede observations, having a Sun-Offset angle of 59.4499236757193 deg. This orientation is designated by the JIRAM Team to be the optimal offset attitude for PJ24 Ganymede observations. The equivalent AZ/EL is -58.833495610326 deg (towards Jupiter dawn) / 10.8416367143037 deg (towards Jupiter S. Pole) offset from the Jupiter-Sun vector for PJ24. RA = 30.113438913339 deg, DEC = 24.6979240941459 deg in EME2000 PJ24_SUNOFFN5P0 is a attitude orientation for PJ24 defined by the Radiation Monitoring Team with a -4.5 deg azimuth (towards Jupiter dawn) / +0.0 deg elevation offset from Jupiter-Sun vector for PJ24. The equivalent J2000 vector is [-0.01470626 0.91763878 0.39714328]. RA = 90.9181550123059 deg, DEC = 23.3997122946027 deg in EME2000 PJ26_SUNOFFP34N9 is an untruncated MWR +34.03897912 deg azimuth (towards Jupiter dusk) / -8.69056334 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ26, effectively towards Juno PON. RA = 137.523758779564 deg, DEC = 6.52863505581866 deg in EME2000 PJ34_EARTHOFF50 is a PJ34 attitude to observe Ganymede by rotating 50 deg from Earthpoint towards Ganymede (in the Earth-Juno-Ganymede plane), defined at the epoch 2021-JUN-07 17:00:00.000 UTC. This orientation is requested by JIRAM to better observe the PJ34 Ganymede encounter. RA = 184.098775732952 deg, DEC = -28.8449880576815 deg in EME2000 ECLIPN is the +Z axis (North pole) of the Ecliptic of J2000 inertial frame (ECLIPJ2000). JOIZ is the reference direction for +Z axis during JOI burn -- RA=268.422 deg, Dec=62.359 deg in EME2000. PRMZ is the reference direction for +Z axis during PRM burn -- RA=268.381 deg, Dec=60.061 deg in EME2000. DEORBITZ is the reference direction for +Z axis during the Deorbit burn -- RA=153.68 deg, Dec=12.39 deg in EME2000. (BUT USES EARTHPOINT) ORBXEARTH is the vector normal to the TOEARTH and JUNOORB vectors in the direction of Jupiter's +Z body axis HALFMWR is an intermediate vector between the TOSUN and -JUNOORB vectors. The TOSUN vector is rotated -20 deg about the ORBXEARTH vector. \begindata DIRECTION_SPECS += ( 'TOSUN = POSITION OF SUN -' ) DIRECTION_SPECS += ( 'FROM JUNO -' ) DIRECTION_SPECS += ( 'CORRECTION LT+S' ) DIRECTION_SPECS += ( 'TOEARTH = POSITION OF EARTH -' ) DIRECTION_SPECS += ( 'FROM JUNO -' ) DIRECTION_SPECS += ( 'CORRECTION XLT+S' ) DIRECTION_SPECS += ( 'JUNOPOS = POSITION OF JUNO -' ) DIRECTION_SPECS += ( 'FROM JUPITER -' ) DIRECTION_SPECS += ( 'CORRECTION NONE' ) DIRECTION_SPECS += ( 'JUNOVEL = VELOCITY OF JUNO -' ) DIRECTION_SPECS += ( 'FROM JUPITER -' ) DIRECTION_SPECS += ( 'CORRECTION NONE' ) DIRECTION_SPECS += ( 'JUNOORB = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUNOPOS JUNOVEL ' ) DIRECTION_SPECS += ( 'PJ05_JUNOORB14 = ROTATE JUNOORB -' ) DIRECTION_SPECS += ( '-14 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT JUNOPOS ' ) DIRECTION_SPECS += ( 'ECLIPN = FIXED ECLIPJ2000 -' ) DIRECTION_SPECS += ( 'XYZ 0 0 1' ) DIRECTION_SPECS += ( 'JOIZ = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 268.422 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 62.359 DEGREES ' ) DIRECTION_SPECS += ( 'PRMZ = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 268.381 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 60.061 DEGREES ' ) DIRECTION_SPECS += ( 'DEORBITZ = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 153.68 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 12.39 DEGREES ' ) DIRECTION_SPECS += ( 'ORBXEARTH = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'TOEARTH JUNOORB ' ) DIRECTION_SPECS += ( 'HALFMWR = ROTATE TOSUN -' ) DIRECTION_SPECS += ( '-20 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT ORBXEARTH ' ) DIRECTION_SPECS += ( 'JUPN = FIXED IAU_JUPITER -' ) DIRECTION_SPECS += ( 'XYZ 0 0 1' ) DIRECTION_SPECS += ( 'JUPS = FIXED IAU_JUPITER -' ) DIRECTION_SPECS += ( 'XYZ 0 0 -1' ) DIRECTION_SPECS += ( 'JNPXSUN = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUPN TOSUN ' ) DIRECTION_SPECS += ( 'JSPXSUN = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUPS TOSUN ' ) DIRECTION_SPECS += ( 'JNPXJUNO = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUPN JUNOPOS ' ) DIRECTION_SPECS += ( 'MWRXSTILT = ROTATE JUPS -' ) DIRECTION_SPECS += ( '1.5 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT JUNOPOS ' ) DIRECTION_SPECS += ( 'PJ19_MWRXSTILT10 = ROTATE MWRXSTILT -' ) DIRECTION_SPECS += ( '-10 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT JNPXJUNO ' ) DIRECTION_SPECS += ( 'PJ09_SUNOFF35 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA -4.4365261787 degrees -' ) DIRECTION_SPECS += ( 'DEC 16.000213933 degrees ' ) DIRECTION_SPECS += ( 'PJ12_SUNOFFN30P20 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 6.81429131 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 23.06360198 DEGREES ' ) DIRECTION_SPECS += ( 'PJ16_SUNOFFN30P20 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 22.52519640 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 29.76854369 DEGREES ' ) DIRECTION_SPECS += ( 'PJ20_SUNOFFN30P5 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 44.39420205 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 21.85059386 DEGREES ' ) DIRECTION_SPECS += ( 'PJ24_SUNOFF59OPT = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 30.11343891 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 24.69792409 DEGREES ' ) DIRECTION_SPECS += ( 'PJ24_SUNOFFN5P0 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 90.91815501 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 23.39971229 DEGREES ' ) DIRECTION_SPECS += ( 'PJ26_SUNOFFP34N9 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 137.52375878 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 6.52863506 DEGREES ' ) DIRECTION_SPECS += ( 'PJ34_EARTHOFF50 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 184.09877573 DEGREES -' ) DIRECTION_SPECS += ( 'DEC -28.84498806 DEGREES ' ) \begintext Orientations ----------------------------------------------------------------- The orientation modes defined in this section are based on the descriptions from sheet 3 of the spreadsheet. SUNPOINTED orientation has +Z along direction from JUNO to the Sun and Ecliptic North pole defining the ZX plane. EARTHPOINTED orientation has +Z along direction from JUNO to the Earth and Ecliptic North pole defining the ZX plane. MWRNON orientation has -Z along JUNO orbital momentum vector (POS cross VEL) and Ecliptic North pole defining the ZX plane. MWRPON orientation has +Z along JUNO orbital momentum vector (POS cross VEL) and Ecliptic North pole defining the ZX plane. PJ05_MWRNONTILT14 orientation has -Z along JUNO orbital momentum vector (POS cross VEL) rotated by -14 deg about POS and Ecliptic North pole defining the ZX plane, as used for PJ05. Resulting RA/Dec (deg) in J2000 (EME2000): -7.67890342 / 13.94323840 PJ09_MWRNONTILT35 orientation towards MWR-TILT attitude, but is truncated in order to achieve a 35 degree sun-offset at PJ09. Resulting RA/Dec (deg) in J2000 (EME2000): -4.436526180 / 16.00021393 PJ12_MWRN30P20 orientation has +Z along -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector, but is truncated in order to achieve a 35 deg Sun-offset at PJ12. Resulting RA/Dec (deg) in J2000 (EME2000): 6.81429131 / 23.06360198 PJ16_MWRN30P20 orientation has +Z along -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector, but is truncated in order to achieve a 35 deg Sun-offset at PJ16. Resulting RA/Dec (deg) in J2000 (EME2000): 22.52519640 / 29.76854369 PJ20_MWRN30P5 orientation has +Z along -30 deg azimuth (towards Jupiter dawn) / +5 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector and is untruncated for PJ20, since the off-Sun angle is less than 35 deg (30.375 deg). Resulting RA/Dec (deg) in J2000 (EME2000): 44.39420205 / 21.85059386 PJ24_SUNOFFSETNEG59OPT orientation redefined by the JIRAM Team for Ganymede observations during PJ24 with a 59.4499236757193 deg Sun-Offset angle, provided as J2000 vector: [0.78590 0.45582 0.41783]. The equivalent AZ/EL is -58.83349561 deg (towards Jupiter dawn) / 10.84163671 deg (towards Jupiter S. Pole) offset from the Jupiter-Sun vector for PJ24. Resulting RA/Dec (deg) in J2000 (EME2000): 30.11343891 / 24.69792409 PJ24_RMSUNOFFN5P0 orientation has +Z along -4.5 deg azimuth (towards Jupiter dawn) / +0.0 deg elevation offset from Jupiter-Sun vector, where the off-Sun angle is equal to 4.49757900505857 deg. The equivalent J2000 vector is [-0.01470626 0.91763878 0.39714328]. Resulting RA/Dec (deg) in J2000 (EME2000): 90.91815501 / 23.39971229 PJ26_MWRP34N9 orientation has +Z along +34.03897912 deg azimuth (towards Jupiter dusk) / -8.69056334 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector, where the off-Sun angle is equal to 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 137.52375878 / 6.52863506 PJ34_50TILT orientation has +Z oriented 50 deg off-Earth toward Ganymede at the epoch 2021-JUN-07 17:00:00.000 UTC. The off-Sun angle is 59.5 deg. Resulting RA/Dec (deg) in J2000 (EME2000): 184.09877573 / -28.84498806 MWRCROSSTRACK orientation has +Z aligned with Jupiter North Pole vector and the Sun defining the ZX plane. PJ19_MWRCROSSTRACKSTILT10 orientation is the MWRCROSSTRACKS orientation but tilted 1.5 deg about the Jupiter-Juno vector at Equator-crossing (towards East) and tilted 10 deg North (in plane containing Jupiter N Pole and Juno Nadir) for PJ19 to allow for more Sun Exposure on solar cells and somewhat constant latitude coverage during each MWR swath. Resulting RA/Dec (deg) in J2000 (EME2000): 91.05155910 / -54.49840350 JOIBURN orientation has +Z along the reference direction during the JOI burn and Ecliptic North pole defining the ZX plane. PRMBURN orientation has +Z along the reference direction during the PRM burn and Ecliptic North pole defining the ZX plane. DEORBITBURN orientation has +Z along the reference direction during the DEORBIT burn and Ecliptic North pole defining the ZX plane. HALFMWRATTITUDE orientation has +Z along the reference direction HALFMWR and Ecliptic North pole defining ZX plane. \begindata ORIENTATION_NAME += 'SUNPOINTED' PRIMARY += '+Z = TOSUN' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'EARTHPOINTED' PRIMARY += '+Z = TOEARTH' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRNON' PRIMARY += '-Z = JUNOORB' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRPON' PRIMARY += '+Z = JUNOORB' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ05_MWRNONTILT14' PRIMARY += '-Z = PJ05_JUNOORB14' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ09_MWRNONTILT35' PRIMARY += '+Z = PJ09_SUNOFF35' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ12_MWRN30P20' PRIMARY += '+Z = PJ12_SUNOFFN30P20' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ16_MWRN30P20' PRIMARY += '+Z = PJ16_SUNOFFN30P20' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ20_MWRN30P5' PRIMARY += '+Z = PJ20_SUNOFFN30P5' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ24_SUNOFFSETNEG59OPT' PRIMARY += '+Z = PJ24_SUNOFF59OPT' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ24_RMSUNOFFN5P0' PRIMARY += '+Z = PJ24_SUNOFFN5P0' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ26_MWRP34N9' PRIMARY += '+Z = PJ26_SUNOFFP34N9' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ34_50TILT' PRIMARY += '+Z = PJ34_EARTHOFF50' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRCROSSTRACK' PRIMARY += '+Z = JUPN' SECONDARY += '-X = TOSUN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ19_MWRCROSSTRACKSTILT10' PRIMARY += '+Z = PJ19_MWRXSTILT10' SECONDARY += '+X = TOSUN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'JOIBURN' PRIMARY += '+Z = JOIZ' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PRMBURN' PRIMARY += '+Z = PRMZ' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'DEORBITBURN' PRIMARY += '+Z = DEORBITZ' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'HALFMWRATTITUDE' PRIMARY += '+Z = HALFMWR' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' \begintext Schedule ----------------------------------------------------------------- The orientation schedule defined in this section implements the spin axis pointing timeline from sheet 1 of the spreadsheet. These times in 'AT' modifiers and START/STOP keywords are given as TDB (Barycentric Dynamic Time). Gaps between attitude modes result in smooth turns from one attitude to the next. \begindata CK-SCLK = 61 CK-SPK = -61 CK-FRAMES = -61900 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2021-06-06/07:44:56.696 CK-61900STOP += @2021-06-07/07:39:56.696 \begintext ******************* PJ34 ****************** \begindata CK-61900ORIENTATION += 'PJ34_50TILT AT 2021-06-07/17:01:09.185' CK-61900START += @2021-06-07/07:44:56.696 CK-61900STOP += @2021-06-08/19:44:56.696 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2021-06-08/19:49:56.696 CK-61900STOP += @2021-06-09/19:44:56.696 \begintext Appendix 2: Information for Rotation About Spin Axis Segment ============================================================= ******************************************************************************** MSOPCK SETUP FILE: juno_sc_nom_study_pj34_50tilt_v01_spin.setup ******************************************************************************** Spin Orientation ----------------------------------------------------------------- The spin orientation segment contains the orientation data representing rotation of the JUNO_SPACECRAFT frame (frame ID -61000) about the JUNO_SPIN_AXIS frame (frame ID -61900). Spin Rate Start UTC End UTC Note --------- ----------------- ----------------- -------- 2 rpm 06/06/21 07:43:48 06/09/21 19:43:47 The profile above was converted to the following input provided to MSOPCK to make this segment (the columns are: start time, stop time, initial orientation as three angles set to zero, and angular velocity representing CCW rotation about +Z): 2021-06-06/07:44:57TDB 2021-06-09/19:44:56TDB 0 0 0 0 0 0.20943951023932 The following MSOPCK setup parameters were used to generate this segment: \begindata LSK_FILE_NAME = '../../SPICE/lsk/naif0012.tls' SCLK_FILE_NAME = '../../SPICE/sclk/JNO_SCLKSCET.00096.tsc' FRAMES_FILE_NAME = '../../SPICE/fk/juno_v12.tf' INTERNAL_FILE_NAME = 'JUNO STUDY SPIN ATTITUDE, 11/24/20' CK_TYPE = 2 CK_SEGMENT_ID = 'JUNO STUDY SPIN ATTITUDE, 11/24/20' INSTRUMENT_ID = -61000 REFERENCE_FRAME_NAME = 'JUNO_SPIN_AXIS' ANGULAR_RATE_PRESENT = 'YES' INPUT_TIME_TYPE = 'UTC' INPUT_DATA_TYPE = 'EULER ANGLES' EULER_ANGLE_UNITS = 'RADIANS' EULER_ROTATIONS_ORDER = ( 'X' 'Y' 'Z' ) ANGULAR_RATE_FRAME = 'INSTRUMENT' PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** RUN-TIME OBTAINED META INFORMATION: ******************************************************************************** PRODUCT_CREATION_TIME = 2020-11-24T11:28:11 START_TIME = 2021-06-06T07:43:47.815 STOP_TIME = 2021-06-09T19:43:46.815 ******************************************************************************** INTERPOLATION INTERVALS IN THE FILE SEGMENTS: ******************************************************************************** SEG.SUMMARY: ID -61000, COVERG: 2021-06-06T07:43:47.815 2021-06-09T19:43:46.815 -------------------------------------------------------------------------------- 2021-06-06T07:43:47.815 2021-06-09T19:43:46.815 ******************************************************************************** End of comments.